ROD-SHIFT 5115436 - Caterpillar

TILT RACK BACK Position
Illustration 11 g03398016
(8) Outlet
(17) Central return passage
(18) Port "B" for the tilt control valve
(19) Bridge passage for the tilt control valve
(20) Port "A" for the tilt control valve
(21) Central supply passage
(22) Tilt control spool
(41) Spring
(45) Pilot oil When the right-hand joystick (24) is moved to the TILT BACK position, the right-hand joystick (24) will send a PWM signal to the machine ECM. The machine ECM will regulate an electrical current to the tilt back solenoid (3) on the control valve (work tool) (1). The tilt back solenoid (3) will direct pilot oil to the right end of the tilt cylinder control spool (22). The pilot oil (45) forces the spool (22) to move to the left against the force of the spring (41). Refer to Operation and Maintenance Manual, "Operator Controls " for TILT BACK position of the right-hand joystick. Oil flows from the inlet (9) to the tilt control spool (22) through the central supply passage (21). Oil is blocked from the inlet (9) by the tilt control spool (22) . The oil opens the check valve (6) for the tilt circuit and flows through the bridge passage (19) and around the spool to port "A" (20). From port "A" (20), oil flows to the rod ends of the tilt cylinders. When oil flows to the rod ends, the oil will cause the work tool to tilt back.Oil that is returning from the head ends of tilt cylinders flows into port "B" (18) and around the spool to the central return passage (17). Oil in the central return passage (17) flows through the outlet (8) and to the hydraulic tank. When the right-hand joystick (22) is released from the TILT BACK position, the spring (41) shifts the spool back to the HOLD position.Auxiliary Control Section
HOLD Position
Illustration 12 g03398017
(8) Outlet
(17) Central return passage
(21) Central supply passage
(22) Tilt control spool
(26) Lift control spool
(27) Auxiliary control spool
(47) Port "B" for the auxiliary control spool
(48) Port "A" for the auxiliary control spool
(49) Spring The "AUX 1" switch (25) and the "AUX 2" switch (23) on the right-hand joystick (24) are momentary push-button switches. When no push-button switch on the right-hand joystick (24) is pressed, the auxiliary control spool (27) is in the HOLD position. When no push-button switch on the right-hand joystick (24) is pressed, no PWM signal is sent to the machine ECM. Oil flows through the inlet (9), around the lift control spool (26), and around tilt control spool (22). Oil continues to flow to the auxiliary control spool (27) and through the central supply passage (21). The oil then flows from the central supply passage (21) into the central return passage (17). From the central return passage (17), the oil flows through the outlet (8) to the hydraulic tank.The control spools block the oil from entering any of the passages. Oil cannot flow to port "A" (48) or port "B" (47). Spring (49) keeps the spool centered because the pilot oil is